Enum RadialScalarKind 

pub enum RadialScalarKind {
    Matern {
        length_scale: f64,
        nu: MaternNu,
    },
    Duchon {
        length_scale: f64,
        p_order: usize,
        s_order: usize,
        dim: usize,
        coeffs: DuchonPartialFractionCoeffs,
    },
    PureDuchon {
        block_order: usize,
        p_order: usize,
        s_order: usize,
        dim: usize,
    },
    ThinPlate {
        length_scale: f64,
        dim: usize,
    },
}

Which radial kernel family is being used. Stored in the streaming operator so that (q, t) scalars can be recomputed on the fly without a closure.

Variants

Matern

Matern kernel: (length_scale, nu).

Fields

length_scale: f64

nu: MaternNu

Duchon

Hybrid Duchon kernel: parameters needed for duchon_radial_jets.

Fields

length_scale: f64

p_order: usize

s_order: usize

dim: usize

coeffs: DuchonPartialFractionCoeffs

PureDuchon

Pure Duchon kernel: a single intrinsic polyharmonic block.

Fields

block_order: usize

p_order: usize

s_order: usize

dim: usize

ThinPlate

Thin-Plate Spline kernel: isotropic with a scalar length-scale, used only with n_axes = 1 (ScalarTotal streaming mode). The chain rule for ψ = log κ = -log(length_scale) and r̃ = ‖x − c‖ gives ∂φ/∂ψ = φ’(z)·z ∂²φ/∂ψ² = φ’‘(z)·z² + φ’(z)·z where z = r̃ / length_scale. With the operator’s c=0, s_0 = r̃², shape_0 = q·s_0 and shape_00 = t·s_0² + 2 q s_0 reproduce both derivatives exactly when q = φ’(r̃)/r̃ and t = (φ’’(r̃) − q)/r̃².

Fields

length_scale: f64

dim: usize

Implementations

impl RadialScalarKind

pub fn eval_design_triplet(&self, r: f64) -> Result<(f64, f64, f64), BasisError>

Trait Implementations

impl Clone for RadialScalarKind

fn clone(&self) -> RadialScalarKind

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RadialScalarKind

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.